Device for opening and closing a cover plate for a pulverizing apparatus



May 22, 1956 T. SAITO DEVICE FOR OPENING AND CLOSING A COVER PLATE FOR A PULVERIZING APPARATUS 3 Sheems-Sheet 1 Filed Nov. 8, 1952 F/El.

HVVENTUR. TOM/Z0 4314/ 72? May 22, 1956 s o 2,746,746

DEVICE FOR OPENING AND CLOSING A COVER PLATE FOR A PULVERIZING APPARATUS Filed Nov. 8. 1952 3 Sheets-Sheet 2 n I u l l l l l I FIE-3 INVENTOR. TOM/Z0 5/4/70 May 22, 1956 T. SAITO 2,746,746

DEVICE FOR OPENING AND CLOSING A COVER PLATE FOR A PULVERIZING APPARATUS 5 Sheets-Sheet 5 Filed Nov. 8, 1952 INVENTOR. TOM/Z0 ,sA/ro 4 4M M United States Patent DEVICE FOR OPENING AND CLOSING A COVER PLATE FOR A PULVERIZING APPARATUS Tomizo Saito, Shinagawa-ku, Tokyo, Japan Application November 8, 1952, Serial No. 319,461

8 Claims. (Cl. 268-74) The present invention relates to a device for opening and closing a cover plate provided on the top of a pulverizing apparatus, particularly of a pulp pulverizing apparatus. The principal object of the present invention is to provide a device for opening and closing the cover plate for a pulverizing apparatus adapted for accomplishing such operations of the cover plate automatically with extreme smoothness and exactness, even in a narrow place of installation, in such a manner that the cover plate provided to cover said apparatus in horizontal position is gradually inclined upwards, while it is moved backwards, from its horizontal position, so that one edge thereof may describe a locus similar to a parabola, and finally into its full open position, where it comes nearly in parallel to the external side wall of the pulverizing drum, and that the cover plate may conduct the said movement in a reverse direction during its closing operatron.

Further objects, features and advantages of this invention will be apparent from the following description of one preferred embodiment thereof with reference to the accompanying drawings, of which Fig. l is a front view of the device of said embodiment;

Fig. 2 is a plan view thereof;

Fig. 3 is a partial sectional view thereof;

Fig. 4 is a front view of the part comprising its rotary frame; and

Fig. 5 is another front view of the rotary frame viewed from the opposite side to that shown in Fig. 4.

Referring to Figs. 1 to 5, the cover plate 4 is carried horizontally on the upper part of a pulverizing drum 3, of which rotary shaft 2 is provided with a series of pulverizing blades 1. The blades 1 comprise two helical blades (Fig. 1) secured on the rotary shaft 2 to revolve therewith for crushing raw material. Lines of rack-teeth 5, 6, 7, 8 are arranged respectively along the bottom and outer faces of rack members at opposite sides of the cover plate. Referring particularly to Figs. 4 and 5 respectively showing certain parts as they would: be viewed looking towards the left and towards the right in Fig. 1, pinions 9 and 10 are respectively in mesh with said rack-teeth 5 and 6, and both said pinions 9 and 10 are fixedly mounted on a common driving shaft 13 passing through a pair of rotary frames 11 and 12 suitably secured to the cover plate 4 and placed at opposite sides of and near the top of the pulverizing drum 3, while the pinions 14, 15, respectively, in mesh connection with the rack-teeth 7, 8 of said rack members are mounted respectively on the shafts 16, 17 for said rotary frames 11, 12. Gear wheels 18, 19 are engaged respectively with said pinions 14, 15, which gear wheels 18, 19 are mounted respectively on rotary shafts 20, 21 journaled in parallel to said shafts 16, 17. Worms 22, 23 are secured respectively on said rotary shafts 20, 21, which worms 22, 23 engage respectively with stationary worm wheels 24, 25 loosely fitted on the above-mentioned driving shaft 13, on which is secured a worm wheel 26. With said worm wheel 26 is engaged a worm 27. The spindle 28 for said worm 27 is connected with the driving shaft of a motor 31 through a universal joint 29 and transmission gear 30. Further, a worm 33 mounted on an upright spindle 32 rotatable by means of said motor 31 engages the worm wheel 34- disposed on one side of the pulverizing drum 3. The said worm wheel 34 is mounted on the cylindrical spindle 35 loosely fitted on the rotary shaft 2 for the pulverizing blades 1. A gear wheel 36 engages with a fixed sector 37. Feet 38, 39 carrying wheels are provided respectively on the right and left sides of external side walls of the pulverizing drum 3. The foot 3?; is positioned at the central portion of its associated external side wall of the pulverizing drum 3, and the other foot 39 at the lower portion of the opposite side wall. Further, an oil cylinder 41 is laid on a bed 40 of the pulverizing drum 3, which oil cylinder 41 is provided with a connecting tube 42. In the upper part of the other end of this connecting tube 42 is inserted a lifting cylinder 43 which is raised under oil pressure.

Operation of the motor 31 operates the worm 33 and thus the worm wheel 34. The gear wheel 36 is thereby rotated. The cylindrical spindle 35 displaces said gear wheel 36, while the latter is kept in mesh relation with the fixed sector 37. Thus, the cylindrical spindle 35, while holding the rotary shaft 2, ascends with said gear wheel 36. Thereby, the pulverizing drum 3 is raised about the other rotary shaft 44 as a central axial line, and adapted to discharge pulverized material out of said drum 3 by inclining it about degrees.

In this case, one foot 38 strikes against the one end of the oil cylinder 41, which moves gradually due to the internal oil pressure and prevents the pulverizing drum 3 from a rapid falling. Thus, it fulfills a buffering action. When the inclined pulverizing drum 3 is made to return to the original position, through the other foot 39 and lifting cylinder 43, the wheel portion at the lower end of said foot 39 descends gradually under the oil pressure in the lifting cylinder 43, thus preventing a rapid return of the drum 3, which also acts as a buffer against impact of the pulverizing drum 3.

Now, the operation of the apparatus according to the present invention will be described as follows: The rotation of the motor 31 sets in rotation the spindle 28 through the transmission gear 30 and universal joint 29. The rotation of said spindle 28 sets in rotation the driving shaft 13 through the worm 27 and worm wheel 26. Thereby the pinions 9, 10 are rotated, which moves the rack teeth 5, 6 and simultaneously the other rack teeth 7, 8. Hence the worms 22, 23 are rotated through the gear wheels 18, 19 and simultaneously moved around the circumferences of the fixed worm wheels segments 24, 25. Consequently, the rotary frames 11, 12 are rotated around the driving shaft 13. Hence, the cover plate 4 has its front end raised by the rotating power of rotary frames 11, 12 and becomes more and more inclined from the horizontal concurrently with a movement thereof both downwardly and rearwardly with its front edge describing a locus similar to a parabola. Thus, the cover plate 4 is inclined backwards on its descending movement, and finally comes to the upright position by the side of the external surface of pulverizing drum 3. Thus, the opening operation of cover plate 4 is completed.

In order to shut the cover plate 4 in returning it to the horizontal position on the top of the pulverizing drum 3, the motor 31 is rotated in the opposite direction as aforementioned. Every transmission gear is rotated reversely, and the cover plate 4 is raised gradually by moving the rack teeth 7, 8 reversely and inclining said plate to the opposite direction to that of the opening movement for said cover plate 4, to complete the shutting operation.

According to the present invention, as described above, the cover-plate position horizontally on the top of the pulverizing drum is gradually made to descend in the opening operation, into the full open position, while being moved by rack and pinion. On the contrary, in the closing operation, the cover-plate is inclined and moved to the opposite direction again into the initial horizontal position, while being raised. As the cover-plate is arranged to be shut in such a manner as above-explained, there is obtained a feature that the opening and closing operations of the cover-plate positioned on the top of the pulverizing apparatus is enabled to function extremely efiiciently and appropriately, even in a narrow place of installation.

What I claim is:

1. In a pulverizing apparatus having a pulp pulverizing drum and a cover for said drum adapted to be positioned substantially horizontally at the top of said drum to close it, a device for opening and closing said cover comprising means mounting the cover on said drum and including a gear mechanism operative to impart thereto a horizontal movement, and means including a second gear mechanism operative simultaneously with said first named gear mechanism to impart to said cover a rotary movement, such that an edge of the cover describes substantially a parabola as the locus of the resultant of both said movements and said cover is positioned alongside an external wall of the drum when fully opened.

2. An apparatus according to claim 1, wherein the first-named means includes a pivotal mounting for the cover and there is a rack and gear means, the last-named means incorporating a gear rotatable about the axis of said pivotal mounting.

3. An apparatus according to claim 1, wherein the first-named means includes a pivotal mounting for the cover, there also being a rack and gear means, the lastnamed means incorporating a gear rotatable about the axis of said pivotal mounting and a rack meshing with said gear and fixedly carried at a side of the cover whereby rotation of said gear moves said rack endwisely and at the same time slides the cover edgewisely.

4. An apparatus according to claim 1, wherein the first-named means includes a pivotal mounting for the cover, there also being a rack and gear means, the lastnamed means incorporating a gear rotatable about the axis of said pivotal mounting and a rack meshing with said gear and fixedly carried at a side of the cover whereby rotation of said gear moves said rack endwisely and at the same time slides the cover edgewisely, the secondnamed means including an operative connection between said rack and the cover for rotating the cover concurrently with the edgewise slide thereof.

5. An apparatus according to claim 1, wherein the first-named means includes a pivotal mounting for the cover, there also being a rack and gear means which incorporates a gear rotatable about the axis of said pivotal mounting and a rack meshing with said gear and fixedly carried along an edge of the cover whereby rotation of said gear moves said rack endwisely and the cover edgewisely, the second-named means including a second gear in meshing relation with a rack component of said rack and gear means, and there being an operative connection between said second gear and said pivotal mounting whereby the cover incidental to its said edgewise movement is rotated about the pivotal axis of said mounting.

6. A11 apparatus according to claim 1, wherein the first-named means includes a pivotal mounting for the cover, there also being a rack and gear means which incorporates a gear rotatable about the axis of said pivotal mounting and a rack meshing with said gear and fixedly carried along an edge of the cover whereby rotation of said gear moves said rack endwisely and the cover edgewisely, the second-named means including a second gear in meshing relation with a rack component of said rack and gear means, and there being an operative connection between said second gear and said pivotal mounting whereby the cover incidental to its said edgewise movement is rotated about the pivotal axis of said mounting, said operative connection including a worm rotating with said second gear.

7. An apparatus according to claim- 1, wherein the first-named means includes a pivotal mounting for cover, there also being a rack and gear means which incorporates a gear rotatable about the axis of said pivotal mounting and a rack meshing with said gear and fixedly carried along an edge of the cover whereby rotation of said gear moves said rack endwisely and the cover edgewisely, the second-named means including a second gear in meshing relation with a rack component of said rack and gear means, and there being an operative connection between said second gear and said pivotal mounting whereby the cover incidental to its said edgewise movement is rotated about the pivotal axis of said mounting, the operative connection last-named including a worm mounted for rotation with said second gear and a worm wheel mounted in fixed position relative to the cover and concentric with said pivotal axis.

8. An apparatus according to claim 1, wherein there are a plurality of rack members fixedly carried by and extended in substantial parallelism with the general plane of the cover, said rack members carrying lines of rack teeth along their sides and also carrying lines of rack teeth along their bottoms, a pair of frames each at one of the opposite sides of the drum near its top, a driving shaft for rotating said frames, pinions fixed on said shaft and in meshing relation with the lines of rack teeth along the bottoms of the rack members, pinions carried by and rotatable relative to said frames and in meshing relation with the lines of rack teeth along the sides of the rack members, worms rotatable with the last-named pinions, and worm wheels fixed on said frames and in meshing relation with said last-named pinions.

References Cited in the file of this patent UNITED STATES PATENTS 1,494,290 Ruhmann May 13, 1924 2,233,789 Lichtenberger Mar. 4, 1941 2,601,566 Soderquist June 24, 1952 FOREIGN PATENTS 475,464 Canada July 24, 1951 

